Pioneer VSX-1016V-K Service Manual page 219

5
USB Troubleshooting
Step 1: Connectors
CN701, CN702
Are
the connectors
securely inserted
?
Yes
To STEP 2
Step 2: Power supply
CN702 (pin 4)
1 5 V input
Is
No
the voltage
5 V ?
Yes
2
IC703 (pin 3)
3.3 V Regulator IC input
Is
No
the voltage
5 V ?
Yes
3
IC951 (pin 14) 3-5 Converter
Is
No
the voltage
5 V ?
Yes
4
IC771 (pin 5) USB Power SW
Is
No
the voltage
5 V ?
Yes
5
IC7814 (pins 14, 15) DAC
Is
No
the voltage
5 V ?
Yes
5
6
No
Insert the connectors
securely.
Is there
No
any loose
connection
of CN702?
Check the
Yes
MOTHER Assy.
To STEP 1
Check the patterns in
the path.
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
6
7
6
IC703 (pin 1), IC702 (pin 7)
Is
the voltage
3.3 V ?
Yes
7
IC762 (pins 37, 47) FLASH ROM
Is
the voltage
3.3 V ?
Yes
8
IC761 (pins 1,3,9,14,27,43,49) SDRAM
Is
the voltage
3.3 V ?
Yes
9
IC953 (pin 14)
Is
the voltage
3.3 V ?
Yes
10
IC701 (pins 16,33,64,76,112) USB Media control IC
Is
the voltage
3.3 V ?
Yes
11
IC702 (pin 1)
Is
the voltage
1.8 V ?
Yes
A
VSX-1016V-K
7
8
3.3 V Reg. output /
1.8 V Reg. input
Is IC703
No
No
abnormally
hot?
Yes
Replace IC703.
The output and GND may be
short-circuited. Check the path
between them.
No
Check the parts and
patterns in the path.
No
Check the parts and
patterns in the path.
5-3 Converter
No Check the parts and
patterns in the path.
No Check the parts and
patterns in the path.
1.8 V Regulator output
Is IC702
No
No
abnormally
hot?
Yes
Replace IC702.
The output and GND may be
short-circuited. Check the path
between them.
8
A
B
C
D
E
F
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